Transcript for Human-Loving Gorilla Doesn't Play Well With Other Gorillas

Very strange story. Look at this. A gorilla sorting through relationship issues. He gets along great with humans. His fellow gorillas, not so much. His keepers are taking more extreme measures. And abc's nick watt explains. Reporter: Patrick, the 430-pound gorilla, just loves us humans. He's a fun-loving big fella. He's quite special. Reporter: When it comes to hanging out with his own kind -- he's had some challenges. Reporter: You see, patrick's mum abandoned him. He was raised by humans. With us, he's all bernie from "zoo keeper." You won't know I'm there. Reporter: But with the other gorillas, at the zoo, he's the biggest, patrick gets all "king kong" about it. Patrick displayed some of that behavior over the years. Reporter: He's not a lady's man. Instead of mating, he's getting up in their grille and pushing them around. So, patrick has no gorilla friends in dallas. None. They tried therapy. They begged him to play nice. No choice. So, patrick moved to south carolina. His last chance to hang out with gorilla his own size. A fresh start. I'm probably going to cry. I'm going to miss him. I've known him for 14 years. He's a good man. Reporter: Sure, the keepers are sad. But these guys, I'll bet they can't wait to see the back of this ever-so-sulky silverback. For "good morning america," nick watt, abc news, los angeles.

This transcript has been automatically generated and may not be 100% accurate.

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